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Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>X</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3872</mml:mn><mml:mo stretchy="false">)</mml:mo><mml:mi>K</mml:mi><mml:mi>π</mml:mi></mml:…
We report the first observation of B0→X(3872)(K+π−) and evidence for B+→X(3872)(K0π+). We measure the product of branching fractions for the former to be B(B0→X(3872)(K+π−))×B(X(3872)→J/ψπ+π−)=(7.9±1.3(stat)±0.4(syst))×10−6 and find that B0→X(3872)K∗(892)0 does not dominate the B0→X(3872)K+π− decay mode. We also measure B(B+→X(3872)(K0π+))×B(X(3872)→J/ψπ+π−)=(10.6±3.0(stat)±0.9(syst))×10−6. This study is based on the full data sample of 711 …